unaccounted-for

[uhn-uh-koun-tid-fawr]

un·ac·count·ed-for

[uhn-uh-koun-tid-fawr]
adjective
not accounted for; not understood; unexplained: an explosion resulting from some unaccounted-for mechanical failure.

Origin:
1790–1800; formed on the verb phrase account for; see un-1, -ed2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To unaccounted-for

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Unaccounted-for has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
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